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Diffstat (limited to '')
-rw-r--r-- | src/jaegertracing/thrift/lib/netstd/Thrift/Transport/TFramedTransport.cs | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/jaegertracing/thrift/lib/netstd/Thrift/Transport/TFramedTransport.cs b/src/jaegertracing/thrift/lib/netstd/Thrift/Transport/TFramedTransport.cs new file mode 100644 index 000000000..de6df7238 --- /dev/null +++ b/src/jaegertracing/thrift/lib/netstd/Thrift/Transport/TFramedTransport.cs @@ -0,0 +1,194 @@ +// Licensed to the Apache Software Foundation(ASF) under one +// or more contributor license agreements.See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership.The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +using System; +using System.IO; +using System.Threading; +using System.Threading.Tasks; + +namespace Thrift.Transport +{ + // ReSharper disable once InconsistentNaming + public class TFramedTransport : TTransport + { + private const int HeaderSize = 4; + private readonly byte[] HeaderBuf = new byte[HeaderSize]; + private readonly Client.TMemoryBufferTransport ReadBuffer = new Client.TMemoryBufferTransport(); + private readonly Client.TMemoryBufferTransport WriteBuffer = new Client.TMemoryBufferTransport(); + private readonly TTransport InnerTransport; + + private bool IsDisposed; + + public class Factory : TTransportFactory + { + public override TTransport GetTransport(TTransport trans) + { + return new TFramedTransport(trans); + } + } + + public TFramedTransport(TTransport transport) + { + InnerTransport = transport ?? throw new ArgumentNullException(nameof(transport)); + + InitWriteBuffer(); + } + + public override bool IsOpen => !IsDisposed && InnerTransport.IsOpen; + + public override async Task OpenAsync(CancellationToken cancellationToken) + { + CheckNotDisposed(); + + await InnerTransport.OpenAsync(cancellationToken); + } + + public override void Close() + { + CheckNotDisposed(); + + InnerTransport.Close(); + } + + public override async ValueTask<int> ReadAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken) + { + CheckNotDisposed(); + ValidateBufferArgs(buffer, offset, length); + + if (!IsOpen) + { + throw new TTransportException(TTransportException.ExceptionType.NotOpen); + } + + // Read another frame of data if we run out of bytes + if (ReadBuffer.Position >= ReadBuffer.Length) + { + await ReadFrameAsync(cancellationToken); + } + + return await ReadBuffer.ReadAsync(buffer, offset, length, cancellationToken); + } + + private async ValueTask ReadFrameAsync(CancellationToken cancellationToken) + { + await InnerTransport.ReadAllAsync(HeaderBuf, 0, HeaderSize, cancellationToken); + var size = DecodeFrameSize(HeaderBuf); + + ReadBuffer.SetLength(size); + ReadBuffer.Seek(0, SeekOrigin.Begin); + + ArraySegment<byte> bufSegment; + ReadBuffer.TryGetBuffer(out bufSegment); + await InnerTransport.ReadAllAsync(bufSegment.Array, 0, size, cancellationToken); + } + + public override async Task WriteAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken) + { + CheckNotDisposed(); + ValidateBufferArgs(buffer, offset, length); + + if (!IsOpen) + { + throw new TTransportException(TTransportException.ExceptionType.NotOpen); + } + + if (WriteBuffer.Length > (int.MaxValue - length)) + { + await FlushAsync(cancellationToken); + } + + await WriteBuffer.WriteAsync(buffer, offset, length, cancellationToken); + } + + public override async Task FlushAsync(CancellationToken cancellationToken) + { + CheckNotDisposed(); + + if (!IsOpen) + { + throw new TTransportException(TTransportException.ExceptionType.NotOpen); + } + + ArraySegment<byte> bufSegment; + WriteBuffer.TryGetBuffer(out bufSegment); + + int dataLen = bufSegment.Count - HeaderSize; + if (dataLen < 0) + { + throw new InvalidOperationException(); // logic error actually + } + + // Inject message header into the reserved buffer space + EncodeFrameSize(dataLen, bufSegment.Array); + + // Send the entire message at once + await InnerTransport.WriteAsync(bufSegment.Array, 0, bufSegment.Count, cancellationToken); + + InitWriteBuffer(); + + await InnerTransport.FlushAsync(cancellationToken); + } + + private void InitWriteBuffer() + { + // Reserve space for message header to be put right before sending it out + WriteBuffer.SetLength(HeaderSize); + WriteBuffer.Seek(0, SeekOrigin.End); + } + + private static void EncodeFrameSize(int frameSize, byte[] buf) + { + buf[0] = (byte) (0xff & (frameSize >> 24)); + buf[1] = (byte) (0xff & (frameSize >> 16)); + buf[2] = (byte) (0xff & (frameSize >> 8)); + buf[3] = (byte) (0xff & (frameSize)); + } + + private static int DecodeFrameSize(byte[] buf) + { + return + ((buf[0] & 0xff) << 24) | + ((buf[1] & 0xff) << 16) | + ((buf[2] & 0xff) << 8) | + (buf[3] & 0xff); + } + + + private void CheckNotDisposed() + { + if (IsDisposed) + { + throw new ObjectDisposedException(this.GetType().Name); + } + } + + // IDisposable + protected override void Dispose(bool disposing) + { + if (!IsDisposed) + { + if (disposing) + { + ReadBuffer?.Dispose(); + WriteBuffer?.Dispose(); + InnerTransport?.Dispose(); + } + } + IsDisposed = true; + } + } +} |